Canon MF820Cdn User's Guide download pdf (Page 16)

Building/Printing a Bar Code

2-3

Getting Started

Printing a Bar Code

This section describes how the Bar Code Printing function prints a bar code.

Cursor Position

Before a bar code is printed, the cursor is located in the bottom left corner under the leftmost

black bar, regardless of the bar code text parameter that is provided. After a bar code is

printed, the cursor moves to the bottom right corner under the rightmost black bar. If you

need to print another bar code, move the cursor to a new position and send the bar code

data. The bar code's PCL font parameter does not need to be sent again.

Transparent Print Data Mode

The following bar code formats support the full 128 character set, from ASCII code 0 to

ASCII code 127, or full binary data (ASCII code 0 to ASCII code 255): Extended 39,

Extended 93, 128A, PDF417, 128auto, MaxiCode, EAN/UCC128, Data Matrix, Aztec,

Codablock, and QRcode.

If you want to print special characters (ASCII code < 32) with any of the bar code formats

mentioned above, a Transparent Print Data PCL sequence (<Esc>&p#X, where <Esc> is

replaced by the ASCII character 27 decimal, and where "#" is replaced with the number of

data bytes that follow, until the next escape sequence), must be immediately followed by the

font selection sequence. This is the only way for the system to determine how many

characters must be printed as bar codes.

NOTE

•

A typeface range (24,580 to 24,900) is activated in combination with a PCL font call sequence:

<Esc>(s#p#h#v#b#s#T, where "#" represents the parameters

•

In this manual, the escape code is preceded by <Esc>. The characters must not be entered as

individual symbols, but must be replaced by the ASCII character 27 decimal.

•

The end of the bar code data determines the bar code type.

- Numeric bar code data: ends with space/CR/LF/FF/escape code

- Alphanumeric bar code data: ends with CR/LF/FF/escape code

•

The bar code can be of any height within the 3 to 960 point size range (1 point size = 1/72").

•

Every bar code system has default options, which are activated when parameters are not provided.

Therefore, you do not need to provide all parameters. For example, if the height is omitted, the

default size is used.

•

If data is invalid (e.g., incorrect size or invalid characters), an X is printed on the bar code, and an

error message describing the problem is automatically added below the bar code. This prevents you

from printing invalid bar codes by mistake.

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Canon MF820Cdn User's Guide Page 16

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